Posts Tagged: ‘adapter’

DS18B20 / 1-wire via Little Wire (USB) / OpenWrt on TL-WR841ND

09/15/2012 Posted by admin

I wanted to interface something to my WR841, without too much hassle.
But also some cheap way to do so, to keep advantages of the WR841 price…

Luckly, I already had an AVR-USB based platform, based on ‘Little Wire’ :

With its latest v1.1 firmware, 1-Wire is available via the Little Wire : that’s my perfect candidate to
add a DS18B20 and to make some temperature measures.

I have quickly cross-compiled the onewire.c example given in the C computer interfacing sources
(Openwrt buildroot, linking the source with libusb-0.1.12) and here is the result :

root@OpenWrt:~# cat /etc/openwrt_release
DISTRIB_DESCRIPTION="OpenWrt Attitude Adjustment r33276"
root@OpenWrt:~# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 003: ID 1781:0c9f Multiple Vendors USBtiny
Bus 001 Device 004: ID 1e3d:8246
root@OpenWrt:~# /root/onewire
> Little Wire firmware version: 1.1
> Address search ...
> Addr#0: 28 4F 4F 7E 2 0 0 3B
> End of search with 1 device(s) found
> Start the talking with the last device found
> 64 1 4B 46 7F FF C 10 1
> 63 1 4B 46 7F FF D 10 15
> 63 1 4B 46 7F FF D 10 15
> 64 1 4B 46 7F FF C 10 1


Update 20/03/2013 :

Created an OpenWrt source package and an ipkg (not tested)

Adding USB to my TL-WR841N (v7.2)

07/18/2012 Posted by admin

This could be a pretty cheap way to get :
- Wireless & Wired network
- CPU performance
- USB 2.0
- I/Os (? still to be tested)

I found that WR841N for 23 euros…

Hack to add USB was found here : DD-WRT Forum
(Adding the serial connector is not even worth mentioning – too easy)
(Lire la suite…)

Hack a USB Reader/adapter to use Cheap SDCard DIY Connector

12/18/2011 Posted by admin

Or how-to add a SIL support to a USB Reader/adapter for breadboard modified SDCards :

I really like the idea that I found somewhere (found it back here) of using a single pin header to connect MMC/SdCard to breadboards

Then using it on a breadboard is easy and convenient


But it is no more usable on the USB card reader/adapter … Unless you are hacking the adapter too !

(Lire la suite…)